/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <cutils/properties.h>
#include <cutils/android_reboot.h>
#include <log/log.h>
#include <private/android_filesystem_config.h>
#include <string.h>
#include <unistd.h>

static void audit(const char* cmd, uid_t uid) {
    char proc_path[100];
    char cmdline[100];
    memset(proc_path, 0, sizeof(proc_path));
    memset(cmdline, 0, sizeof(cmdline));
    pid_t ppid = getppid();
    snprintf(proc_path, sizeof(proc_path), "/proc/%d/cmdline", ppid);
    FILE *f;
    f = fopen(proc_path, "r");
    if (f) {
        fgets(cmdline, sizeof(cmdline), f);
        fclose(f);
    }
 
    ALOGD("reboot. cmd: %s. Invoked by pid: %d uid: %u cmdline: %s", cmd, ppid, uid, cmdline);
}
 
int main(int argc, char* argv[]) {
    int ret;
    size_t prop_len;
    char property_val[PROPERTY_VALUE_MAX];
    static const char reboot[] = "reboot";
    const char* cmd = reboot;
    char* optarg = "";

    opterr = 0;

    uid_t uid = getuid();
    if (!(uid == AID_ROOT || uid == AID_SYSTEM || uid == AID_SHELL)) {
        fprintf(stderr, "Permission denied\n");
        exit(EXIT_FAILURE);
    }
 
    do {
        int c;

        c = getopt(argc, argv, "p");

        if (c == -1) {
            break;
        }

        switch (c) {
        case 'p':
            fprintf(stderr, "Shutdown is not supported yet.\n");
            exit(EXIT_FAILURE);
        case '?':
            fprintf(stderr, "usage: %s [rebootcommand]\n", argv[0]);
            exit(EXIT_FAILURE);
        }
    } while (1);

    if(argc > optind + 1) {
        fprintf(stderr, "%s: too many arguments\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    if (argc > optind)
        optarg = argv[optind];
    if (!optarg || !optarg[0]) optarg = "shell";

    prop_len = snprintf(property_val, sizeof(property_val), "%s,%s", cmd, optarg);
    if (prop_len >= sizeof(property_val)) {
        fprintf(stderr, "%s command too long: %s\n", cmd, optarg);
        exit(EXIT_FAILURE);
    }
    
    audit(cmd, uid);
 
    property_set("sys.action.shutdown", "1");

    ret = property_set(ANDROID_RB_PROPERTY, property_val);
    if (ret < 0) {
        perror(cmd);
        exit(EXIT_FAILURE);
    }

    // Don't return early. Give the reboot command time to take effect
    // to avoid messing up scripts which do "adb shell reboot && adb wait-for-device"
    if (cmd == reboot) {
        while (1) {
            pause();
        }
    }

    fprintf(stderr, "Done\n");
    return 0;
}
